//
// * Copyright (c) 2002-2009 "Neo Technology,"
// *     Network Engine for Objects in Lund AB [http://neotechnology.com]
// *
// * This file is part of Neo4j.
// * 
// * Neo4j is free software: you can redistribute it and/or modify
// * it under the terms of the GNU Affero General Public License as
// * published by the Free Software Foundation, either version 3 of the
// * License, or (at your option) any later version.
// * 
// * This program is distributed in the hope that it will be useful,
// * but WITHOUT ANY WARRANTY; without even the implied warranty of
// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// * GNU Affero General Public License for more details.
// * 
// * You should have received a copy of the GNU Affero General Public License
// * along with this program. If not, see <http://www.gnu.org/licenses/>.
// 
namespace org.neo4j.kernel.impl.persistence
{


	internal class PersistenceSourceDispatcher
	{
		private static Logger log = Logger.getLogger(typeof(PersistenceSourceDispatcher).Name);

		private PersistenceSource ourOnlyPersistenceSource = null;

		internal PersistenceSourceDispatcher()
		{

		}

///    
///     <summary> * Returns the persistence source that should be used to persist <CODE>obj</CODE>. </summary>
///     * <param name="obj">
///     *            the soon-to-be-persisted entity </param>
///     * <returns> the persistence source for <CODE>obj</CODE> </returns>
///     
		internal virtual PersistenceSource getPersistenceSource()
		{
			return this.ourOnlyPersistenceSource;
		}

///    
///     <summary> * Adds a persistence source to the dispatcher's internal list of available
///     * persistence sources. If the dispatcher already knows about <CODE>source</CODE>,
///     * this method fails silently with a message in the logs. </summary>
///     * <param name="source">
///     *            the new persistence source </param>
///     
		internal virtual void persistenceSourceAdded(PersistenceSource source)
		{
			this.ourOnlyPersistenceSource = source;
		}

///    
///     <summary> * Removes a persistence source from the dispatcher's internal list of
///     * available persistence sources. If the dispatcher is unaware of <CODE>source</CODE>,
///     * this method fails silently with a message in the logs. </summary>
///     * <param name="source">
///     *            the persistence source that will be removed </param>
///     
		internal virtual void persistenceSourceRemoved(PersistenceSource source)
		{
			if (this.ourOnlyPersistenceSource == source)
			{
				this.ourOnlyPersistenceSource = null;
			}
			else
			{
				log.severe(source + " was just removed, but as far as we're " + "concerned, it has never been added.");
			}
		}
	}
}